1. Department of Orthopaedic Surgery, Gifu University School of Medicine, Gifu, Japan
2. Department of Orthopaedic Surgery, Nagoya University Hospital, Aichi, Japan
3. Department of Endoprosthetic Surgery, Oita University, Yufu, Japan
4. Department of Orthopaedic Surgery, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama, Japan